First Look at the White Stripes on 'The Simpsons'

Aren't their outfits kind of black and grey? Since when is grey in the White Stripes' color palette? Anyhow, this cool shot is the first one we've seen from the White Stripes upcoming (as in September 19th) appearance on The Simpsons. Why is Milhouse so agitated? All will be revealed in time.